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Avalanche Forecast

Archived

Apr 28th, 2021–Apr 30th, 2021

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

Yukon.

New snow and wind are forecast to arrive in White Pass tomorrow. The bond between this new snow and existing hard surfaces should be closely assessed. If storm snow amounts exceed 20cm in the area you are riding, the danger rating will rise to Considerable. 

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

WEDNESDAY NIGHT: -5C, winds NE 10km/hr, cloudy, snow beginning near midnight amount 3cm

THURSDAY: low -5C high +1C, wind NE 10km/hr changing to SW at 40km/hr later in the afternoon, cloudy, 10cm snow

FRIDAY: low -2 high 0C, wind SW 20km/hr, mostly cloudy, 5cm snow

SATURDAY: low -2, high 0C, wind SW 15km/hr, broken skies, 3cm snow

Avalanche Summary

No new avalanches have been reported in over a week. 

A big THANK YOU to all of you that provided us and fellow recreationists with observations this season. Please continue to do so if you head out!

Snowpack Summary

The White Pass received a dusting of new snow on Tuesday. Snow arriving this week will fall on very firm surfaces, crusts, and old avalanche debris. New snow often takes time to bond to these types of surfaces. 

The lower snowpack in White Pass is deep for this time of year with no layers of concern. Areas further inland, such as the Wheaton Valley, may have a shallower and weaker snowpack. 

Cornices are still very large. Recent cold temperatures have kept cornice failures to a minimum but they should always be treated with respect in the spring, especially when temperatures rise. 

Terrain and Travel

  • Pay attention to the wind, once it starts to blow fresh sensitive wind slabs are likely to form.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.